.setUncaughtExceptionHandler(UNCAUGHT_EXCEPTION_HANDLER)
            .build()
            .newThread(monitoredRunnable)
            .getUncaughtExceptionHandler());
  }

  public void testBuildMutateBuild() {
    ThreadFactory factory1 = builder.setPriority(1).build();
    assertEquals(1, factory1.newThread(monitoredRunnable).getPriority());

    ThreadFactory factory2 = builder.setPriority(2).build();